Hollywood star Gwyneth Paltrow was forced to have her "booty kicked" for her role in Iron Man - because she wasn't fit enough for the film's action sequences. The actress was forced to undertake a gruelling fitness regime for her part as secretary Virginia 'Pepper' Potts in the comic book adaptation, despite having only one fight scene in the entire movie.She says, "I only have one action sequence at the end but they wanted me in tip-top shape so I did a lot of working out. "I did a twice-a-day nightmare, super-hard cardio. I had this amazing trainer and she kicked my booty totally."Iron Man is the latest Marvel comic character to be adapted for the big screen following in the footsteps of Fantastic Four, The Hulk and Daredevil.Iron Man is one of the lesser known Marvel characters. Tony Stark is forced to build a weapon when he is captured in Afghanistan - he develops the Iron Man suit which he uses to escape.In the title role is Robert Downey Jr and he is supported by Terrance Howard and Jeff Bridges.

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